Zibo Dafang New Materials Science and Technology Limited Company,I was founded in 2011, is a new start-up company!Focus on silicon nitride ball bearings, silicon nitride products production,We have cooperation with several scientific research institutions,Size of a quarter to 2 inches silicon nitride ball bearings,A variety of specifications and silicon nitride products.Air pressure sintering process.性能指标(Performance indicators)数值(Reference value)密度(Density) 3.26--3.29 （g/cm3）弹性模量(Elasticity modulus) 290--330 （GPa）泊松比(Poisson's ratio) 0.24--0.28热膨胀系数(Thermal expansivity)（室温(indoor temperature)---500℃） 2.5--3.0 （×10-6/℃）弯曲强度(Bending strength)σ 650--900 （MPa）压碎负荷比(Crush load than) 35--40 （%）硬度(Vickers hardness) 15000--15800（MPa）（HV10）断裂韧性(Fracture toughness) 5--6 （MPa.m1/2)气孔大小(Pore size)：≤10um
